package com.cwz.gateway.handler;

import com.cwz.core.utils.servle.ServletUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.web.reactive.error.ErrorWebExceptionHandler;
import org.springframework.cloud.gateway.support.NotFoundException;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ResponseStatusException;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * @program: w-demo
 * @description: 网关统一异常处理
 * @author: Wen
 **/
@Order(-1)
@Configuration
@Slf4j
public class GatewayExceptionHandler implements ErrorWebExceptionHandler {
	@Override
	public Mono<Void> handle(ServerWebExchange exchange, Throwable ex) {
		ServerHttpResponse response = exchange.getResponse();
		// response.isCommitted() 可检查看服务端是否已将数据输出到客户端.如果返回值是 TRUE 则已将数据输出到客户端,是 FALSE 则还没有。
		if (response.isCommitted()) {
			return Mono.error(ex);
		}
		String msg;
		if (ex instanceof NotFoundException) {
			msg = "服务未找到";
		} else if (ex instanceof ResponseStatusException) {
			ResponseStatusException responseStatusException = (ResponseStatusException) ex;
			msg = responseStatusException.getMessage();
		} else {
			msg = "内部服务器错误";
		}
		log.error("[网关异常处理]请求路径:{},异常信息:{}", exchange.getRequest().getPath(), ex.getMessage());
		return ServletUtils.webFluxResponseWriter(response, msg);
	}
}
